13. Archimedes' principle If an object such as a ball is placed in a liquid, it will either sink to the bottom, float, or sink a certain distance and remain suspended in the liquid. Suppose a fluid has constant weight density w and that the fluid's surface coincides with the plane z = 4. A spherical ball remains suspended in the fluid and occupies the region x² + y² + (z – 2)² < 1. a. Show that the surface integral giving the magnitude of the total force on the ball due to the fluid's pressure is п Force = lim w(4 – za) Aok = n00 k=1 za) Δσ w(4 – z) do. b. Since the ball is not moving, it is being held up by the buoy- ant force of the liquid. Show that the magnitude of the buoy- ant force on the sphere is Buoyant force = w(z – 4)k •n doơ, where n is the outer unit normal at (x, y, z). This illustrates Archimedes' principle that the magnitude of the buoyant force on a submerged solid equals the weight of the displaced fluid. c. Use the Divergence Theorem to find the magnitude of the buoyant force in part (b).

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Chapter2: Second-order Linear Odes
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13. Archimedes' principle If an object such as a ball is placed in
a liquid, it will either sink to the bottom, float, or sink a certain
distance and remain suspended in the liquid. Suppose a fluid has
constant weight density w and that the fluid's surface coincides
with the plane z = 4. A spherical ball remains suspended in the
fluid and occupies the region x² + y² + (z – 2)² < 1.
a. Show that the surface integral giving the magnitude of the
total force on the ball due to the fluid's pressure is
п
Force = lim w(4 – za) Aok =
n00 k=1
za) Δσ
w(4 – z) do.
b. Since the ball is not moving, it is being held up by the buoy-
ant force of the liquid. Show that the magnitude of the buoy-
ant force on the sphere is
Buoyant force =
w(z – 4)k •n doơ,
where n is the outer unit normal at (x, y, z). This illustrates
Archimedes' principle that the magnitude of the buoyant force
on a submerged solid equals the weight of the displaced fluid.
c. Use the Divergence Theorem to find the magnitude of the
buoyant force in part (b).
Transcribed Image Text:13. Archimedes' principle If an object such as a ball is placed in a liquid, it will either sink to the bottom, float, or sink a certain distance and remain suspended in the liquid. Suppose a fluid has constant weight density w and that the fluid's surface coincides with the plane z = 4. A spherical ball remains suspended in the fluid and occupies the region x² + y² + (z – 2)² < 1. a. Show that the surface integral giving the magnitude of the total force on the ball due to the fluid's pressure is п Force = lim w(4 – za) Aok = n00 k=1 za) Δσ w(4 – z) do. b. Since the ball is not moving, it is being held up by the buoy- ant force of the liquid. Show that the magnitude of the buoy- ant force on the sphere is Buoyant force = w(z – 4)k •n doơ, where n is the outer unit normal at (x, y, z). This illustrates Archimedes' principle that the magnitude of the buoyant force on a submerged solid equals the weight of the displaced fluid. c. Use the Divergence Theorem to find the magnitude of the buoyant force in part (b).
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